22-01-2011, 02:50 PM
JOHN LIGUORI
CONSULTING ENGINEER
MSEE, PE
UNINTERRUPTIBLE POWER SUPPLIES
THIS PRESENTATION IS FOR INFORMATIONAL AND EDUCATIONAL PURPOSES ONLY. IT DOES NOT CONTAIN ALL INFORMATION REQUIRED, AND IS NOT INTENDED TO BE USED FOR THE SPECIFICATION OR DESIGN OF UNINTERRUPTIBLE POWER SUPPLIES (UPS) OR UPS SYSTEMS.
UNINTERRUPTIBLE POWER SUPPLIES OUTLINE
INTRODUCTION
POWER DISTURBANCES
UNINTERRUPTIBLE POWER SUPPLIES
GENERAL DISCUSSION
SUMMARY
REFERENCES
QUESTIONS
INTRODUCTION
PURPOSE
WHAT IS AN UNINTERRUPTIBLE POWER SUPPLY?
WHY USE A UPS?
PURPOSE
THE PURPOSE OF THIS PRESENTATION IS TO DISCUSS THE DIFFERENT TYPES OF UNINTERRUPTIBLE POWER SUPPLIES AVAILABLE, WHAT THE UPS PROTECTS AGAINST, THE COMPONENTS OF A UPS, AND ISSUES REGARDING SELECTION AND SIZING.
THE DIFFERENT TYPES AND CAUSES OF POWER DISTURBANCES ARE DISCUSSED, AS WELL AS WHAT THE POWER UTILITY, THE ORIGINAL EQUIPMENT MANUFACTURER, AND YOU, CAN DO TO MINIMIZE THEIR EFFECT.
WHAT IS AN UNINTERRUPTIBLE POWER SUPPLY?
AN UNINTERRUPTIBLE POWER SUPPLY (UPS) IS A DEVICE THAT HAS AN ALTERNATE SOURCE OF ENERGY THAT CAN PROVIDE POWER WHEN THE PRIMARY POWER SOURCE IS TEMPORARILY DISABLED
THE SWITCHOVER TIME MUST BE SMALL ENOUGH TO NOT CAUSE A DISRUPTION IN THE OPERATION OF THE LOADS
WHY USE A UPS?
PROTECTS AGAINST MULTIPLE TYPES OF POWER DISTURBANCES
ONLY DEVICE THAT PROTECTS AGAINST AN OUTAGE
OFFERS PROTECTION AGAINST
EQUIPMENT NOT OPERATING PROPERLY
COMPUTER AND EQUIPMENT DAMAGE
DATA LOSS
TIME AND EXPENSE TO RECOVER BACK TO WHERE YOU WERE, IF EVEN POSSIBLE
POWER DISTURBANCES
CAUSES
TYPES
DURATION
RESULTING PROBLEMS
COMMENTS
WHAT THE POWER UTILITY CAN DO
WHAT THE ORIGINAL EQUIPMENT MANUFACTURER (OEM) CAN DO
WHAT YOU CAN DO
PROTECTIVE DEVICES
CAUSES OF POWER DISTURBANCES
STORM ACTIVITY – LIGHTNING, WIND, ICE
OBJECTS COMING IN CONTACT WITH POWER LINE AND TRIPPING BREAKER – TREE BRANCHES, ANIMALS, OTHER
UTILITY FAULT CLEARING
CONSTRUCTION ACTIVITY
ACCIDENTS – MOTOR VEHICLE, OTHER
EQUIPMENT FAILURE
OVERLOADING
LOAD SWITCHING
NON-LINEAR LOADS
POOR GROUNDING
ESD
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